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- W2085304893 abstract "We consider a Josephson junction device which has a symmetry of a tetrahedron; it can be visualized as a tetrahedron that contains two Josephson junctions at each edge. We find the conditions for which the ground state of the system is degenerate or almost degenerate; in this case, the low-energy degrees of freedom can be mapped on a quantum spin $1∕2$. We evaluate the effect of the physical perturbations and imperfections on the level splitting in this system and find that they are small for most perturbations. We argue that this system can provide a possible physical implementation of a protected quantum bit with a built-in error correction. We propose a way of manipulating the effective quantum spin by means of electrical potentials and an experimental scheme to read the information that it contains." @default.
- W2085304893 created "2016-06-24" @default.
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- W2085304893 date "2004-06-21" @default.
- W2085304893 modified "2023-09-23" @default.
- W2085304893 title "Theoretical investigation of a protected quantum bit in a small Josephson junction array with tetrahedral symmetry" @default.
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- W2085304893 doi "https://doi.org/10.1103/physrevb.69.214513" @default.
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